Cavity-enhanced absorption spectroscopy with a rapidly swept diode laser |
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Authors: | B. Bakowski L. Corner G. Hancock R. Kotchie R. Peverall G.A.D. Ritchie |
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Affiliation: | (1) Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, UK, GB |
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Abstract: | Cavity-enhanced absorption spectroscopy is explained in terms of the transmission function of a rapidly swept interferometer, and the integrated transmission is shown to be proportional to the cavity ringdown time. The technique is demonstrated on the b1Σg +-X3Σg - (1,0) band in molecular oxygen at 687 nm using a tunable diode laser and a relative-ly high-Q optical cavity (finesse ≈4000). A detection limit of 3×10-8 cm-1 s1/2 is achieved for a 0.8 cm-1 scanning range. Received: 24 June 2002 / Revised version: 5 August 2002 / Published online: 15 November 2002 RID="*" ID="*"Corresponding author. Fax: +44-1865/275410, E-mail: peverall@physchem.ox.ac.uk |
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Keywords: | PACS: 42.55.Px 42.62.Fi 42.68.Ca |
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